Update existing uses of /wd4267 to use the GN config

third_party/yasm/BUILD.gn

Index: third_party/yasm/BUILD.gn
diff --git a/third_party/yasm/BUILD.gn b/third_party/yasm/BUILD.gn
index cd9b4532e6c8b1f9d052ac12702392d367288006..ffa17d9021d2f551eb0073aef96a0fac6cb318d4 100644
--- a/third_party/yasm/BUILD.gn
+++ b/third_party/yasm/BUILD.gn
@@ -143,13 +143,13 @@ if (current_toolchain == host_toolchain) {
     configs += [
       ":yasm_config",
       "//build/config/compiler:no_chromium_code",
+      # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
+      "//build/config/compiler:no_size_t_to_int_warning",
     ]
 
     # re2c is missing CLOSEVOP from one switch.
     if (is_posix) {
       cflags = [ "-Wno-switch" ]
-    } else if (is_win) {
-      cflags = [ "/wd4267" ]  # size_t to int conversion.
     }
   }
 
@@ -240,6 +240,8 @@ if (current_toolchain == host_toolchain) {
     configs += [
       ":yasm_config",
       "//build/config/compiler:no_chromium_code",
+      # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
+      "//build/config/compiler:no_size_t_to_int_warning",
     ]
 
     # Yasm generates a bunch of .c files which its source file #include.
@@ -248,9 +250,7 @@ if (current_toolchain == host_toolchain) {
     # directory, but the gen_x86_insn.py script does not make this easy.
     include_dirs = [ yasm_gen_include_dir ]
 
-    if (is_win) {
-      cflags = [ "/wd4267" ]  # size_t to int conversion.
-    } else {
+    if (!is_win) {
       cflags = [
         "-ansi",
         "-pedantic",